group athletic adult men and women performing sit exercises strengthen their core abdominal muscles fitness |
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| navigate by keyword : group fitness women training athletic abdominal men sit adult workout people young fit exercise gym healthy strong abs active muscular body slim girl sport working abdomen man strength sportive muscle flexibility aerobic sportswear person leisure effort physical health multiethnic sporty instructor toning activity ups female athletes determination cross lifestyle physique |
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| Group of athletic adult men and women performing sit up exercises to strengthen their core abdominal muscles at fitness training. |
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